How would a computer enhance the productivity of a business

Computers are very purposeful, in life and business. They can do things in seconds that would take the human mind considerably longer (if at all) to figure out.
A computer can improve things like marketing, communication, customer service, conferencing, etc.
Specifically, it would produce productivity by saving an essential thing. Time. It would easily cut down how long it takes to do something. It can help employees communicate, keep logs, print out things for marketing, keep track of e-mails for work, etc. It would all around boost proficiency.  

A public in-state college charges less for in-state tuition than for out-of-state tuition.

Tara will most likely have to pay room and board expenses at an out-of-state public college, but might be able to commute to a public college in state.